Elbow-bending machine.



H. C. H. WALSI.' ELBOW BENDING MACHINE. APPLIoATIoN 31mm 22.19, 1909.

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H'. 0. H. WALSH.-

' ELBOW BENDING MACHINE.

APPLICATION FILED APB.19,'1909.

y 975,184. Patented Nov. 8, 1910.

8 SHEETS-SHEET 2.

unf mnml CU/ilnesse l MM v H. G. H. WALSH; vELBOWBENDIM MAUHINE.

APPLICATION FILED APB.19, 1909.

Patented Nov. 8, 1910.

3 BHEETS-SHBET 3.

UNITED sTATEs PATENT oEErcE.

HARRY C. H. WALSH, OF CHICAGO, ILLINOIS, ASSIGNOR OF ON E-HALF TO A. A.KINNE, OF MINNQEAPOLIS, MINNESOTA.

ELBOW-BENDING MACHINE.

Speciication of Letters Patent.

Patented Nov. 8, 1910.

To all whom it may concern:

Be it known that I, HARRY C. H. WALSH, a .citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Elbow-Bending Machines,of which the following is a specification.

This invention relates to improvements in elbow bending machines and hasamong its salient objects to provide a machine for formingv an elbow ona flat curve or curve of relatively long radius whereby the stretching`or torturing the metal at the upper radius of the curve is distributedover substantially the entire surface of the metal instead of beinglocalized; to provide a construction in which one of the mandrelsreciprocates toward the pivoted mandrel during the operation of bendingthe pipe in order to accomplish the above stated object; to provide a'construction which permits of the pipe being readily inserted upon themandrels or removed therefrom; to provide improved means for clampingthe metal in place upon the mandrels; to provide a device which isdurable and economical in construction and simple and reliable inoperation; and in general to provide an improved construction of thecharacter referred to.

The inventionconsists in the matters hereinafter described and moreparticularly pointed out in the appended claims.

In the drawings-Figure 1 is a top plan view of the machine with certainparts shown in dotted lines in order to more clearly bring out thedetails of construction. Fig. 2 is a side elevation of the same with themandrels shown in normal position. Fig. 3 is an end elevation partly insection taken on lines 3, 3 of Fig. 2 and looking in the direction ofthe arrows. Fig. 4 is an end elevation of the other end of the machinethe operating handle or lever being shown in section. Fig. 5 is afragmentary horizontal section and showing more particularly theconstruction of the pivotal mandrel.

Referring to the drawings 1 designates the base casting or bed plateprovided at y either corner with an ear like extension 2 whereby it' maybe mounted upon any desired supporting frame (not shown). At one endthis casting is provided at opposite sides with a pair of up-standingguides 4, 4

a mandrel 8 of well known construction.

The base member 7 is secured between the guides 4 by means of confiningplates 9 fixed to the respective guides'4 by means of suitable screwbolts 10. Near the inner end of the guide-way 3 the bed plate 1 is apertured as shown at 12 to receive the journal stud 13 of a turret member14. At its upper face the bed plate is provided with an annular base 11upon which the turret member turns. The latter is provided with arearwardly extending supporting bracket 15 which carries a mandrel 16.Each of these mandrels preferably takes the form of a hollow castingslightly bent inwardly in order to more accurately conform to thecurvature of the elbow when the latter is being formed. As shown moreclearly in Fig. 5 the mandrels are secured to their supporting bracketsby means of suitable bolts 17, 17.

In order to lock the pipe upon the mandrels the latter are each providedwith a pair of clamping jaws 18 and 19. Upon the rear end of each of therespective castings 6 and 15 Vis secured a journal block 2O at eitherend of which is pivotally connected a forked eX- tension 21 of therespective jaws by means of pivot pins 22 screw threaded through therear ends of the forks and engaging suitable apertures formed in theupper and lower sides of the journal block as shown more clearly in Fig.3. Each pair` of jaws is provided at its outer end with inturned lips 23which it over inclined shoulders 24 formed upon the opposite surfaces ofthe mandrel whereby the pipe may be more securely clamped in position.

To 'clamp the jaws to the mandrels, through the respective bracketmembers 6 and 15 is loosely mounted a pin or rod 24 which also extendsthrough the rear end of the corresponding clamping jaws 18 and 19. Thatend of the rod 24 which extends through the clamping jaw 18 is screwthreaded as shown at 25 and is provided with a confining nut 27 whichengages an annular boss 30 formed upon the opposed face of the jaw 18.This nut 27 is further locked in position by means of a jam nut 26. Tothe other end of the rod 24 is pivotally connected as shown at 29 a camlever 31 having an operating handle 32. The cam surface 33 of this leveractuates a collar- 3t looselyH A,cfa bracke't having sliding movementyin mounted upon the rod 24 and adapted to engage the boss 28 carried bythe clampingk jaw 19. The bracket members 6 and 15 are eachcounter-bored to provide socket mem-V bers 35z 35 in each of which isseated a coiled expansion spring 36.` These springsengaga the clampingjaws and automatically force the latter out of engagement with themandrel when the cam surface 33 is swung out of enga ement with: thelock-in'gfring The sliding. bracket 6 carrying the mandre 8 isprovidedat-its rear end'. with' fa lhandle 37 whereby it maybe bodilyreciprocated in the guide i way.v Si1nilai"ly-.lthe pivoted bracket l-isprovided with anfi operating lever 38 which is screw threaded as shown'at 39 into the yjournal ,block 20.-- y

described-as follows: Theinandrel Sis reciprocated toward .the rear 'endof the guide way 3 bymeans ofthe handle 37 andthe pipe pla-cedinposition uponthe mandrels, theendsfof the. pipe. extending, of course,between ,the clampingjaws.; The latter` are then forced into clampingengagement with the mandrels and lockedin this position by means of thecam levers 31.: Themandrel 16k is then swung on its -pivotloy means ofthe operatingI lever A38 and the pipe bent. It is tol be noted howeverthat;the bracket 6 carrying the mandrel 8,.is-ree' to slide forwardly inits guide way. .Accordingly the` strain upon the upper periphery of thepipe due tothe stretching vof the metal wil-l be distributed oversubstantially the entire upper surfacesof the pipe. I This results fromthe fact that the pipe -is bent on a curve of .relatively large;radiusrather .than on 'aI curve of small radius as isthecase when one ofthe mandrels is held ,positively in fixed position during thebending ofthe pipe.

While Iy haverherein shown a preferred embodimentof .my invention it isapparentl etails;

that it maybe more orl less varied in of construction without departingfrom the spirit thereof.

I claim as myv invention 1.- Iii-a pipe bending machine, `thecombination with a main frame provided with a guide -way extendingylongitudinallyA thereof,

said guide-way, a second bracket pivotally connected to the main frameby a fixed pivot, a mandrel rigidly mounted in each bracket, 'means forclamping a pipe on said mandrels, .and leverage mechanism for r0- tatingthe second bracket, said parts being 'so arranged that uthe firstbracket has sliding movement and the second bracket rotary movementduring the operation of bending.

the pipe. v. g, v, n 2. In a .pipe bending machine,- the combinationwith amainframe having a guide.-

;way extending longitiidinally' thereoifof a bracket mounted-to slide."freely in'said guide-way, a secondbracket pivotally vcon- 1 v nectedto the main frame by axed pivot, a v The operation ofthe device maybebriefly mandrel carried by each` bracket, means for clamping the pipe toveach mandrelv compris- .ing a .journalipm extending 'transversely'lthrough each bracket, a l:pair of clamping yjaws carried by oppositevendsof saidY pin, lcam leverage mechanismfor'=.shifting` said rod toforce the Ij aws into clamping engage-Y ment with thevmandrel, yandsprings seated in sockets formed' in each bracket and normally forcingthe clamping jaws out of engagement with the mandrel, and leveragemechanism for rotating the pivot'bracket, said parts being so arrangedthat' the -rst bracket slides freely in itsguide-wayfand the secondbracket: lrotates on its pivot `during the operationof bending the pipe.

3. In a pipe bending machine, the combination with a main frame, of amandrel having free sliding movementtherein, a second mandrel pivotallymounted to the main frame bya stationary pivot, and locked againstsliding movement, means' for clamping a pipeto said mandrels, said'partsbeing `so arranged that said mandrels have dier-V ent movements duringthe operation 'of bendingr the pipe, the rst mandrel having slidingmovement and the second rotary movement. f '.f

, HARRY C. H. WALSH.

VVit'nesses:y i

EMILIE ROSE, Lois FORCE.'

